protected void Button2_Click(object sender, EventArgs e)
        {
            Label8.Text = "";
            DateTime dt;
            string   dateTime = TextBox5.Text + " " + TextBox6.Text;

            try
            {
                if (string.IsNullOrWhiteSpace(TextBox5.Text) || string.IsNullOrWhiteSpace(TextBox6.Text))
                {
                    throw new Exception("Appointment Date and Appointment Time cannot be empty");
                }
                else if (!DateTime.TryParse(dateTime, out dt))
                {
                    throw new Exception("Appointment date format should be: yyyy/MM/dd and appointment time format should be: HH:mm:ss.");
                }

                ADODatabaseService adodbs = new ADODatabaseService();

                Boolean result = adodbs.AppointmentReschedule(TextBox1.Text, TextBox2.Text, TextBox3.Text, TextBox4.Text, Convert.ToDateTime(dateTime));
                if (result == true)
                {
                    Label8.Text = "Updated successfully";
                }
            }
            catch (Exception ex)
            {
                Label8.Text = ex.Message;
            }
        }